调用EditText的clearFocus方法以在从软键盘单击完成按钮时失去焦点。执行如下操作：

editText.setOnEditorActionListener(new OnEditorActionListener() {        
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if(actionId==EditorInfo.IME_ACTION_DONE){
            //Clear focus here from edittext
             editText.clearFocus();
        }
    return false;
    }
});

并在编辑文本xml中添加android:imeOptions="actionDone"

如果有人遇到这个问题，想知道如何在活动中一次取消所有内容的焦点，他们可以将焦点设置在父布局（或任何相关布局）上。

findViewById(R.id.myLayout).requestFocus();

只是一个更完整的答案

//  This will change the ‘RETURN’ button in your the EditText’s soft keyboard to a ‘DONE’ button.
editText.setImeOptions(EditorInfo.IME_ACTION_DONE);
//  Use the InputMethodManager to close the soft keyboard
editText.setOnEditorActionListener(new OnEditorActionListener() {        
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if(actionId==EditorInfo.IME_ACTION_DONE){
            //Clear focus here from edittext
            InputMethodManager imm = (InputMethodManager)v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
        }
    return false;
    }
});

Kotlin，这对我很有效：

main.clearFocus()

main是根ConstraintLayout

Kotlin版本的ρяσ ρ я K's answer：

editText.setOnEditorActionListener { _, actionId, _ ->
    if (actionId == EditorInfo.IME_ACTION_DONE) {
        editText.clearFocus()
    }
    false
}